net/mlx5: fix Rx queue resource cleanup

mlx5_rxq_start() allocates rxq_ctrl->obj and frees it on failure,
but did not set it to NULL. Later mlx5_rxq_release() could not recognize
this object is already freed and attempted to release its resources,
resulting in a crash:

    Configuring Port 0 (socket 0)
    mlx5_common: Failed to create RQ using DevX
    mlx5_common: Can't create DevX RQ object.
    mlx5_net: Port 0 Rx queue 0 RQ creation failure.
    Segmentation fault

Set rxq_ctrl->obj to NULL after it is freed to skip resource release.

Fixes: 1260a87b2889 ("net/mlx5: share Rx control code")
Cc: stable@dpdk.org
Signed-off-by: Dmitry Kozlyuk <dkozlyuk@nvidia.com>
Acked-by: Matan Azrad <matan@nvidia.com>

diff --git a/drivers/net/mlx5/mlx5_trigger.c b/drivers/net/mlx5/mlx5_trigger.c
index ca43bd51aab27fcede21611dcdeb246a5580c11a..dacf7ff272ae99e17532bfe42777e7330ccd2561 100644 (file)
--- a/drivers/net/mlx5/mlx5_trigger.c
+++ b/drivers/net/mlx5/mlx5_trigger.c
@@ -230,6 +230,7 @@ mlx5_rxq_start(struct rte_eth_dev *dev)
                ret = priv->obj_ops.rxq_obj_new(dev, i);
                if (ret) {
                        mlx5_free(rxq_ctrl->obj);
+                       rxq_ctrl->obj = NULL;
                        goto error;
                }
                DRV_LOG(DEBUG, "Port %u rxq %u updated with %p.",